send mouse and keyboard events into active window

Question

I have the code below, which allows me to send keyboard and mouse events and it works for me with any game or app. I can send a keypress and the game will accept it not like other libraries (pyautogui, keyboard, pyinpuy, etc., for some reason not all games works).

user32 = ctypes.WinDLL('user32', use_last_error=True)

INPUT_MOUSE    = 0
INPUT_KEYBOARD = 1
INPUT_HARDWARE = 2

KEYEVENTF_EXTENDEDKEY = 0x0001
KEYEVENTF_KEYUP       = 0x0002
KEYEVENTF_UNICODE     = 0x0004
KEYEVENTF_SCANCODE    = 0x0008

MOUSEEVENTF_MOVE = 0x0001
MOUSEEVENTF_LEFTDOWN = 0x0002
MOUSEEVENTF_LEFTUP = 0x0004
MOUSEEVENT_ABSOLUTE = 0x8000
SM_CXSCREEN = 0
SM_CYSCREEN = 1
MAPVK_VK_TO_VSC = 0

UP = 0x26
DOWN = 0x28
A = 0x41
ENTER = 0x0D


wintypes.ULONG_PTR = wintypes.WPARAM

class MOUSEINPUT(ctypes.Structure):
    _fields_ = (("dx",          wintypes.LONG),
                ("dy",          wintypes.LONG),
                ("mouseData",   wintypes.DWORD),
                ("dwFlags",     wintypes.DWORD),
                ("time",        wintypes.DWORD),
                ("dwExtraInfo", wintypes.ULONG_PTR))

class KEYBDINPUT(ctypes.Structure):
    _fields_ = (("wVk",         wintypes.WORD),
                ("wScan",       wintypes.WORD),
                ("dwFlags",     wintypes.DWORD),
                ("time",        wintypes.DWORD),
                ("dwExtraInfo", wintypes.ULONG_PTR))

    def __init__(self, *args, **kwds):
        super(KEYBDINPUT, self).__init__(*args, **kwds)
        # some programs use the scan code even if KEYEVENTF_SCANCODE
        # isn't set in dwFflags, so attempt to map the correct code.
        if not self.dwFlags & KEYEVENTF_UNICODE:
            self.wScan = user32.MapVirtualKeyExW(self.wVk,
                                                 MAPVK_VK_TO_VSC, 0)

class HARDWAREINPUT(ctypes.Structure):
    _fields_ = (("uMsg",    wintypes.DWORD),
                ("wParamL", wintypes.WORD),
                ("wParamH", wintypes.WORD))

class INPUT(ctypes.Structure):
    class _INPUT(ctypes.Union):
        _fields_ = (("ki", KEYBDINPUT),
                    ("mi", MOUSEINPUT),
                    ("hi", HARDWAREINPUT))
    _anonymous_ = ("_input",)
    _fields_ = (("type",   wintypes.DWORD),
                ("_input", _INPUT))

LPINPUT = ctypes.POINTER(INPUT)

def _check_count(result, func, args):
    if result == 0:
        raise ctypes.WinError(ctypes.get_last_error())
    return args

user32.SendInput.errcheck = _check_count
user32.SendInput.argtypes = (wintypes.UINT, # nInputs
                             LPINPUT,       # pInputs
                             ctypes.c_int)  # cbSize

def Press(hexKeyCode):
    hexKeyCode = VK_CODE.get(hexKeyCode)
    x = INPUT(type=INPUT_KEYBOARD,
              ki=KEYBDINPUT(wVk=hexKeyCode))
    user32.SendInput(1, ctypes.byref(x), ctypes.sizeof(x))
    x = INPUT(type=INPUT_KEYBOARD,
              ki=KEYBDINPUT(wVk=hexKeyCode,
                            dwFlags=KEYEVENTF_KEYUP))
    user32.SendInput(1, ctypes.byref(x), ctypes.sizeof(x))

def Mouse(dx, dy, flags):
    x = INPUT(type=INPUT_MOUSE, mi=MOUSEINPUT(dx, dy, 0, flags, 0, 0))
    user32.SendInput(1, ctypes.byref(x), ctypes.sizeof(INPUT))

the thing is I want to send the events to only one app (hwnd) like this for example but using the code above.

def click(x, y):
    hWnd = win32gui.FindWindow(None, "MyApp")
    lParam = win32api.MAKELONG(x, y)

    hWnd1= win32gui.FindWindowEx(hWnd, None, None, None)
    win32gui.SendMessage(hWnd1, win32con.WM_LBUTTONDOWN, win32con.MK_LBUTTON, lParam)
    win32gui.SendMessage(hWnd1, win32con.WM_LBUTTONUP, None, lParam)

How I can mix these two codes to make it happen?